Statement I : When $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}(\mathrm{en})\right]_

Question

Statement I : When $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}ight)_{4}(\mathrm{en})ight]_{(\mathrm{aq})}^{2+}$ is converted to $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}ight)_{2}(\mathrm{en})_{2}ight]_{(\mathrm{aq})}^{2+}$ the pale blue colour turns to purple\ Statement II : Strong (en) ligand causes. d-d transition of electron\

Professor PC Thomas Classes · Answer

When the ligand $\mathrm{H}_{2} \mathrm{O}$ is replaced by a stronger ligand (en), the splitting energy $\Delta_{0}$\ increases, higher energy is required for $\mathrm{d}-\mathrm{d}$ transition - colour changes.\